The product was purchased for a foundational kinesiology class. I only used the skeleton 3 times for the 3 submissions. After the first project, the arms came off. After the second project, the head fell off. I had to submit the third project with the arm stuck in the hip socket. This is very poorly made. My projects simply entailed coloring in on the model (in Pen) the origin and insertion of muscles. I've never purchased anything so cheaply and poorly constructed. Very surprising that my skeleton was the only one that fell apart. Very embarrassing. Gratefully, I still received an A in the course.